21. Solving a chemistry problem
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146. 7.1506 g of technical Mohr’s salt NH4)2Fe(SO4)2*6H2O was dissolved in a 200.00 cm3 volumetric flask. To titrate 20.00 cm3 of the resulting solution, 14.62 cm3 of 0.0983 N KMnO4 solution is consumed. Calculate the mass fraction (in %) of iron ions in the sample.
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